Method of treating paper.



.Mzesses/ s. R. WAGG. METHOD OF TREATING PAPER. APPLICATION FILED NOV.20, 1913.

1, 1 28,200. Patented Feb, 9, 1915.

Zia/en for 02002 0701?. a

-WITED OFFICE- Todlqvkomit may concern: .Be it known that I, SOLOMON B.Waco, a citizen of the UnitedStates, residing at Apleton, in the countyof Outagamie and Gate of Wisconsin, have invented new and psefulImprovements .in Methods of- Treat-- fication. 4

The present inventionv has reference .to'the mg Bapenof which thefollowing is'a speci- =treatment of paper, more especially of paper inthe form of continuous strips-or webs, the invention comprehendinggenerally, an improved method of treatment, whereby the tensile strengthand ink-resistasmuch as it enables the use oflessexpensive sizing.

The new and improved treatment, like the earlier, maybe carried out withor by the aid of any suitable'apparatus, an embodiment of that preferredbeing shown diagrammatically in the accompanying draw- Tn said drawing,1 indicates, generally, the strip or web of paper undergoing treatment,and 2 the bath of size, preferably starch through which the same ispassed as the initial ste of such-treatment. The web or strip, whichhaspreviously been subjected to the usual,'preliminary engine sizing, withor without mordants, may be led to the starch size bath either directlyfrom the machine, or afterit has first been dried and reeled up.

On leaving the starch bath, the web is passed between the rolls 3 and 4,which serve to squeeze out the excess size therefrom, and from these.rolls it is led, while still wet, beneath and around a smoothed cylinder6 of polished copper which'serves to initially smooth the-web and toprepare I it for subsequent wet winding. From this cylinder the webpasses, successively, to the take-up, smoothing and winding'devi'ces orSpecification of Lettersla'tent.

mechanisms.

' sem nar 1}- wace, .91 summon. WISCONSIN. mnrnbn or TREATING rarer.

Patented Feb. 9, 1915.

Application fiied november 2o, 19 13. s ziauvb.-ao2,149.

These devices are, preferably, ofthe types shown and described in mycompanion application, Serial Number 802,148, v

filed of even date herewith, andthe one first mentigned embodies aspring-pressed roll 8 39d"tt-"iifiing-and-falling dance roll 9., which e.so mounted and arranged as to exert a ic zomplemental, or cooperativeaction upon ".theweb, the former roll moving forward and backward towardand from the frame wherein the other roll is mounted. Thus the .tworolls work oppositely, and, in their action, insure a continuous andregular feed movement of .the web by preventing breakage, relievingshocks and absorbing slack.

.The Web, as'shown, passes over roll 8 and under r0119, and thence tothe smoothing device 22. Reference maybe had to my said companionapplication fora complete description of this device, and it is,accordingly considered sufiicient for present purposes to state that itconsists of a pair of rolls arranged ata forwardly-directed angle toeach other, such arrangement causing a stretching and spreading of theweb transersely, with the result that .all straight wrinkles and puckerswill be smoothed out therefrom.

The action of the smoothing device is supplemented by the windingmechanism, the

drum 7 of which is so'constructed as to provide for the elimination offine puckers and wrinkles due to the presence of air or air bubblesunder the web, to which end its peripheral wall is suitably perforated,so as to break up the bubbles and dissipate the air during the travel ofthe web over'the drum. The web then passes to the reel 20 whereonv it iswound while still wet.

When the winding operation has been completed, the roll of paper isremoved in its wet state from its support, and placed upon a frame 31,where it is allowed to remain for a period of time varying from one totwelve hours, during which time it is kept wet by being covered with.wet cloths 32.

The rest to which the roll of a er is thus subjected, permits a veryextend; and grad-- ual permeation of the roll by the starch size, andin-consequence the tensile strength and ink-resisting property of thepaper are increased, while, at the same time, the engine size is enabledto set and a'union, soto speak, is produced between the sizes and alsothe mordants when the latter are used. After restin in the manner justdescribed, the thent oroughly saturated paper is unreeled and thetreatment is .either partially or wholly repeated, according to theweight of the paper and other qualities it is desired that it shouldpossess. For example, in making relatively light papers,'the saturatedpaper is unreeled from the roll and then subjected. to a second sizingtreatment, whereupon the paper is passed over a series of hollow rolls33for its final drying, the rolls being supplied with steam from somesuitable source.

In making relatively heavy or very hard sized paper, the paper after thesecond sizing treatment is preferably wound while wet into a roll andthereby submitted to a sec ond prolonged rest period, whereupon it maybe unwound from the roll and dried by passin it over the rolls 33, asbefore. It is to be 0 served, therefore, that this final drying stepdoes not take place until after the completion of the aforementionedperiod or periods of rest. In consequence, all danger of injury due torapid and premature drying, and, generally, to the presence of highheat, is avoided, since such rest has been found from actual practice torender the paper proof against injury of this character. For this reasonit has been found perfectly practicable to utilize steam heat, with itsrelatively very low cost, for drying purposes, in'place of the extremelyexpensive air-drying which has hitherto been deemed compulsory owing tothe danger of injury fromthe high temperatures of steam-heat.

The present invention enables high quality papers to be manufacturedwith the use of starch sizing,the advantages in its favor, from aneconomic standpoint, over gelatin and other sizes being too obvious torequire extended discussion. On the other hand, however, paper treatedin the ordinary manner with starch size has been found practically.worthless, since itofiers unsatisfactory resistance to ink, but whenallowed to rest in a wet state, while wound up, in accordance with thepresent method,.this objection is completely obviated, as theink-resistance is increased to such an extent that soaking, spreadingand creeping of the ink are entirely prevented.

SOLOMUNIR. waste.

Witnesses: I

M. A. SCHUH, JACOB KoEHN.

